Tool for assembling spool heads on electromagnet cores



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- E. IBERGMAN 'I'QOL FOR ASEMBLING SPOOL HEADS ON ELECTROMAGNET CORES Filed Aug. 11: 1922 2 sheets-sheet 1 n A "mi-A {7a 19 ATTORNEYJ E. BERGMAN TOOL FOR ASSEMBLING SPOOL HEADS ON ELECTROMAGNET C ORES Filed Aug. 11. 1922 i7 25 2 Sheets-Sheet 2 A TTORNE Y5 rant-s EDWARD BERGMAN, or new YORK, n. Y., assrenos re 0. renannns, INCORPORATED, A oonrosarron on NEW YORK.

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Application filed August 11, 1922. Serial No. 581,156.

T (/21 whom it may] concern:

Be it known that I, EDWARD BERGMAN, a citizen of the United. New York, in the county of New York,

' State of New York, have invented certain new and useful Improvements in Tools for Assembling Spool Heads on Electromagnet (lores'; and I as hereby declare the iiollowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention has for its object the provision of a tool for speedily and accurately assembling spool heads on electro-magnet cores.

The specific embodiment of the invention described in detail hereinafter is especially designed for operating on 'a particular type of telephone receiver electro-magnet, but the scope of the invention is such as to include tools of a'similar character for operating on electro-magnets of widely differing designs.

The preferred form of assembling tool in accordance with the invention comprises a base which is adapted to be mounted on the bed of the punch press and having means such as a recessedblock for properly positioning and supporting an electro-magnet core; a yieldably mounted intermediate member having a slot through which a por i l tion of the magnet core may pass during;

the assembling operationfand a recess for positioning and hold ng one ot the spool heads; a punch operable coirjointly with the intermediate member to force the spool heads on to the magnet core; and a mechanism'ptor ejecting the assembled core and spool heads. a p

The outstanding features of the invention relatebotlrto the means provided for performing the assembling operations and to the means for ejecting-the assembled units from the tool. These features maybe more adequately and clearly described in connec tlon with the accompanying drawings in which Figure 1 1s a front elevation of the assembled tool in its non-operated position; Figure 2 is a view similar to Figurel but showing the tool in its fully operated position;

Figure S is a plan view of the ibase'of the tool taken along the lin e"83 of igure' 1; F igure is a v1ew of the punch and punch States, residing at showing carrier taken along the line 4 4: of F ig ure 1; 7

Figure 5 is a plan view of the yieldably mounted intermediate member and the ejector inechanism;

Figure 6 is a view similar to Figure 5 but the ejector mechanism fully operated;

Figurev T is a cross sectional view taken along the line 7-7 of Figure 2 and showing the tool in its fully operated position;

Figure 8 is a cross sectional view similar to Figure '7 except that it shows the tool in its non-operated posit-ion;

Figure 9 is a perspective view of an electro-magnet core and a single spoolhead illustrating the first step in the assembling operation; I v a 1 Figure 10 is a perspective yiew of an assemblol'l core and spool head unit; and

Figure 11 is a cross section of an assembled core and spool head unit.

Referring now to Figure 10,'t-here is shown a telephone receiver electro-magnet core 1 which, as will be seen has the form of an angle iron thevertical legof which serves as the core proper of the magnet,

and the horizontal leg of which is formed in a way to facilitate mounting in the telephone receiver case. A pair of spool heads 2 and 3 are shown mounted on the vertical leg of the core 1. These spool heads are tightly titted head 3 is of the type disclosed in the copending application of Fredericli Dietrich. and Edward Bergman, Serial ,No. 567,928,

filed June 13, 1922, and is provided with a 135111 of inserted soldering terminals l.

The function of the assembling tool which constitutes thesubject matter of the present invention is to quickly and accurately force the spool heads 2 and 3 on to the core 1; to properly space the spool heads one from the other; and to stake the end of the vertical leg of the core 1 as shown at 5 in Figure 11. By the term stake is meant the shearing and compressing of the metal, as indicated in Figure 11, for the purpose of securing the spool head 2 on thecore The first step in the assembling operation consists in placing the lower spool head 3 on the end oi the vertical leg of the core 1, as shown in Figure 9.

on the core. The lower spool IOU The operation to be performed having now been clearly stated, the tool for performing this operation will, it is thought, be readily understood.

The base 6 may be of cast iron, and is provided with a pair of slots 7 for bolting down to the'bed plate of the punch press. A block 8, preferably of steel, rests on and is secured to the base 6 by any suitable means, and a nest plate 9 having a recess 9 with a contour conforming to that of the horizontal leg of the magnet core 1 is secured to the block 8 by means of flat head screws 10. The recess 9, it will be seen, accurately locates the magnet core for the operation to be performed.

The member 11, referred to hereinafter as the intermediate member, is preferably of machined steel, and is yieldably mounted on the helical springs 12 and held in proper alignment with the other parts of the tool by means of the liner pins 13, which pass through apertures therein having a close running [it on the liner pins. The intermediate member 11 has a slot 11 of suitable dimensions to permit the vertical leg of the magnet core 1 to pass therethrough, and a recess 11. having a contour corresponding with that of the spool head 2 is also provided on the intermediate member.

The intermediate member is adaptd to be forced downwardly against the tension of the springs 12 by the punch carrier 14, which is secured in the tool head of the punch press. A pair of steel blocks 15 are secured to the punch carrier 141 by means of screws 16. The function of the blocks 15 is to engage the upper surface of the intermediate member 11 and thereby to force the latter downwardly. A punch 17 having a shank 17 is secured in a suitable aperture provided in the punch carrier 14 by means of set screw 18. The lower end of the punch 17 has an exterior contour corre sponding with that of the spool head 2, as shown most clearly in Figure 4. This punch i is so constructed as to have a recess 17 of a width slightly greater than that of the vertical leg of the magnet core and a length slightly less than that of the vertical leg of the magnet core. In order to facilitate its manufacture, the punch is constructed of three principal parts, these comprising the main body portion 17 and the two members 19 of tool steel, which are secured to the main body portion. by means of the rivet 20. The members 19 are provided with cutting edges at 19, which are adapted for performing the staking operation as indicated in Figure 11.

From the description so far given it will be clear that with a magnet core mounted on the block 8 as shown, having a spool head 3 placed thereon and a spool head 2 in the recess 11, a downward movement of the punch carrier 14 will result in the spool head 3 being forced downwardly on the magnet core by the intermediate member, and the spool head 2 being forced on to the end of the magnet core by the punch 17, and the end of the magnet core being staked.

To provide for removal of the assembled unit comprising the magnet core and spool heads, the recess 11 is of necessity open at the front, but in order to provide complete support for the spool head 2, a bar 21, into which a portion of the recess 11" is cut, is slidably mounted in a channel in the face of the intermediate member and a strip 22 is secured to the face of the intermediate member by screws 23 for retaining the bar 21 in place.

The provision for ejecting the assembled unit from the slot 11 comprises an ejector pin 24 which is slidable longitudinally in an aperture in the intermediate member. The end portion 24 of the ejector pin is milled to form a blade which will pass within the slot 11 for forcing the assembled unit out of the slot. A lever arm 25 is pivotally mounted on the pin 26 and is also pivotally secured at its free end to the ejector pin 24. A pin 27 carried by the lever arm 25 engages the elongated slot 28 in the short arm 29 of the bell crank 30, of which the long arm 31 forms a part. The elongated slot 28 provides lost motion between the movement of the lever arms 81 and The lever arm 31 is adapted to be operated by hand, its end portion being omitted from the drawing for lack of room. The slide 21 is pivotally secured to the lever arm 31 by-means of pin 32. A spring 33 normally holds lever arm 81 and the other parts connected therewith in their normal positions, as shown in Figure 5.

Figures 1 and 2 illustrate quite clearly the successive steps in the operation of forcing the spool heads on to the magnet core, which it is thought will be readily understood without further elaboration. Figures 5 and 6 considered consecutively clearly illustrate the. operations involved in ejecting the as sembled unit from the tool. Here it will benoted that on account of the lost motion provided by the elongated slot'28 the slide 21 is moved completely out of the path of the assembled unit before the ejector pin 24 is started in its forward movement to eject the assembled unit from the tool.

It will be understood by those skilled in the art that tools embodying the present invention may be readily designed to accommodate magnet cores and spool heads of almost any form, and that the invention is not in any Way limited to the specific form herein described.

I claim:

1. In a tool of the class described, a base for supporting a magnet core, a punch, a yieldable intermediate member having a slot for clearing the magnet core, and a rellll) cess for receiving and positioning one of the spool heads, said punch being operable to effect a movement of said intermediate member toward said base and thereby to force both spool heads on to said core.

2. In a tool of the class described, a base adapted to support and position a magnet core, a yieldably mounted intermediate member, and a punch, said punch and intermediate member being operable conjointly to force two spool heads on to the magnet core and to properly position said spool heads thereon.

3. In a tool of the class described, a base adapted to support and position a magnet core, a yieldably mounted intermediate memher, and a punch, said punch and intermediate member being operable conjointly'to force two spool heads on to the magnet core and to properly position said spool heads thereon, said punch being provided with cutting edges for staking the end of the magnet core for retaining the spool heads thereon.

l. In a tool of the class described, a base adapted for supporting a magnet core, a punch adapted to force a spool head on to the magnet core, and a yieldably mounted intermediate member disposed between said base and said punch, said intermediate memher being adapted for holding and properly positioning a spool head relatively to the magnet core whereby a stroke of said punch is effective to assemble the spool head on the magnet core.

5. In a tool of the class described, a base having means for properly positioning and supporting a magnet core, a yieldable member adapted for supporting and positioning one of the spool heads in proper relation to the magnet core, a slot in said member of suitable size to permit a portion of said core to pass therethrough, and a punch operable to force said yieldable member together with the spool head supported thereon toward said core, whereby said spool head is assembled on said core, and means operable for ejecting'the assembled core and spool heads from the tool.

6. In a tool of the class described, a base having means for positioning and supporting a magnet core, a yieldably mounted intermediate member having a slot for securing the magnet core, and a recess for receiving and positioning one of the spool heads, a slide mounted on said intermediate member for normally closing one side of said slot, a device for ejecting the assembled core and spool heads from the tool, common operating means for said ejector and said slide, and a punch operable conjointly with said intermediate member to force the spool heads onto said core.

7. In a. tool of the class described, a base 7 adapted to support and position. a magnet core, a yieldably mounted intermediate memher, a punch, said intermediate member and punch being conjointly operable to force the spool heads on to the magnet core, and an ejector mechanism comprising an ejector pin operable to force the assembled core and spool heads from the tool, a slide normally operable to retain the magnet core within a slot in said intermediate member, and common means operable first to move said slide away from said slot and second to operate said ejector pin.

8. In a tool of the class described, an ejector mechanism for the assembled core and spool heads of a magnet core comprising an ejector pin, a slide, a pivoted lever arm having its free end pivotally connected with said ejector pin, and a second lever arm connected with said slide and having a lost motion connection with said first lever arm, whereby said slide and said ejector pin are operable consecutively in response to a single operation of said second lever arm.

In testimony whereof I ailix my signature.

EDWARD BERGMAN.

Kill 

